If 50% of a radioactive element remains after 4000 years, what is the half-life?

Question

a
2000 years
b
4000 years
c
8000 years
d
12000 years

Answer 1

The half-life of a radioactive element is the time it takes for half of the substance to decay. If 50% of the radioactive element remains after 4000 years, this indicates that 4000 years is the time it has taken for the substance to reduce to half its original amount.

Therefore, the half-life of the element is:

b) 4000 years.